In-app purchases are broken in the Windows Store, according to reports on Microsoft's developer forums.

The issue, which was first highlighted by Neowin, appears to be affecting a number of Windows Store users who try and buy content within an app.

This is a problem for developers ahead of Christmas an in-app purchases are a key way of making money. The app can be free, making it more appealing, and additional features can then be bought.

Developers such as Supercell, the studio behind "Clash of Clans," makes millions of dollars per week from in-app purchases.

Developers first highlighted the issue on December 18 and it appears to be persisting until today for many developers and users. According to Microsoft, the Windows Store has over 350,000 apps, many of which are supported by in-app purchases.

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